.........The picture is from the "Bushwick Burn Tests" conducted on at least a dozen vacant frames in 1974.....the tests were to evaluate different things the biggest was to see if there was a material that could be retrofitted in common cocklofts to stem Fire spread (nothing really worked)......john t ohagan the FC/COD at the time conducted the tests in conjunction w/Poly Tech Univ (he liked live burns for tests...he also burned some vacant commercial bldgs slated for demo to study the effects of a simulated open floor plan hi-rise office bldg after the One NY Plaza Fire around 1970).........the Tiller rig in the photo is a fairly new '74 Seagrave since it still has the shortlived sliding Tiller canopy which was replaced w/a fixed canopy w/sliding side doors by Seagrave shortly after the FDNY had started purchasing them in '74..........i am not sure about the sedan....could it be one of the '70 Fords that DIV & Staff Chiefs had back then ?..........in the excellent photo book titled "FIRE !" by Steve Scher that was published in 1978 by Harry N. Abrams Inc. N.Y. the foldout centerfold has pictures of the Bushwick tests.